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Hematocrit (he-MAT-uh-krit) is the proportion of your total blood volume that is composed of red blood cells. A hematocrit (Hct) test indicates whether you have too few or too many red blood cells — conditions that can occur as the result of certain diseases. Red blood cells, or erythrocytes (uh-RITH-roe-sites), transport oxygen throughout your body.

A hematocrit test is done using a sample of your blood. A lab technician puts the sample in a device called a centrifuge that spins the blood very quickly in a test tube. This motion separates your blood into three parts: the fluid component (plasma), red blood cells and other blood cells. When the blood is separated, the technician can determine what proportion of the cells are red blood cells. Hematocrit is also called packed-cell volume (PCV).

Hemoglobin is a protein in your red blood cells that carries oxygen to your body's organs and tissues and transports carbon dioxide from your organs and tissues back to your lungs.

If a hemoglobin test reveals that your hemoglobin level is lower than normal, it means you have a low red blood cell count (anemia). Anemia can have many different causes, including vitamin deficiencies, bleeding and chronic diseases.

If a hemoglobin test shows a higher than normal level, there are several potential causes — the blood disorder polycythemia vera, living at a high altitude, smoking, dehydration, burns and excessive vomiting.

A prothrombin time test measures how quickly your blood clots. Sometimes called a pro time test or PT test, a prothrombin time test uses a sample of your blood.

Prothrombin is a protein produced by your liver that helps your blood to clot. When you bleed, a series of chemicals (clotting factors) activate in a stepwise fashion. The end result is a clot which stops the bleeding. One step in the process is prothrombin turning into another protein called thrombin. The prothrombin time test measures how well the clotting process works and how long it takes to occur.